U.S. 421 over I-94 Bridge Rehabilitation
LaPorte County, Indiana
Included in a larger road reconstruction project, U.S. 421 over I-94 two-span bridge deck (222-ft.-6-in.-0 degrees’ skew), was a replacement project within a cloverleaf interchange. The overall project included replacement of the existing 40-year-old concrete pavement on mainline U.S. 421 and part of each of the eight interchange ramps, replacement of bearings at the end bents with conversion to semi-integral end bents and the replacement of steel fixed bearings at the median frame bent with elastometric bearings. The existing twin structures were combined into one structure by eliminating the 1-in. longitudinal joint between northbound and southbound decks. The existing profile grade was raised to accomplish a 2% standard cross-slope (originally 1.56%) and provided the desired 16-ft. - 6-in. under clearance for I-94 below. LFA’s practical design approach resulted in significant savings to INDOT. Savings resulted from a Level One Design Exception regarding an insufficient bridge width per current requirements. This approved design exception prevented the need for additional work on both the superstructure and substructure units. A change in maintenance of traffic, from the original concept plan, provided additional savings and added value through the project development cycle. Working closely with Michigan City, LFA guided aesthetic enhancements to the upgraded structure that provides for a visually appealing and memorable bridge at the gateway to Michigan City.
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